Granted Patent
Utility
US 4,640,491 · App. 06/747,322
Waler corner lock assembly
Inventors:
Warren W. Grist, David L. Kelly
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Jun 21, 1985
Inventors
Warren W. Grist
David L. Kelly
Assignee (at issue)
Burke, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.